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______________________________________________________________________
White run lengths Code word Black run lengths Code word
______________________________________________________________________
64 11011 64 0000001111
128 10010 128 000011001000
192 010111 192 000011001001
256 0110111 256 000001011011
320 00110110 320 000000110011
384 00110111 384 000000110100
448 01100100 448 000000110101
512 01100101 512 0000001101100
576 01101000 576 0000001101101
640 01100111 640 0000001001010
704 011001100 704 0000001001011
768 011001101 768 0000001001100
832 011010010 832 0000001001101
896 011010011 896 0000001110010
960 011010100 960 0000001110011
1024 011010101 1024 0000001110100
1088 011010110 1088 0000001110101
1152 011010111 1152 0000001110110
1216 011011000 1216 0000001110111
1280 011011001 1280 0000001010010
1344 011011010 1344 0000001010011
1408 011011011 1408 0000001010100
1472 010011000 1472 0000001010101
1536 010011001 1536 0000001011010
1600 010011010 1600 0000001011011
1664 011000 1664 0000001100100
1728 010011011 1728 0000001100101
EOL 000000000001 EOL 000000000001
______________________________________________________________________
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Note - It is recognized that machines exist which accommodate
larger paper widths maintaining the standard horizontal resolution.
This option has been provided for by the addition of the Make-up
code set defined as follows:
Tableau 2/T.4 [T2.4], p.12
4.1.4 Return to control (RTC)
The end of a document transmission is indicated by sending six
consecutive EOLs. Following the RTC signal, the transmitter will
send the post message commands in the framed format and the data
signalling rate of the control signals defined in
Recommendation T.30.
Format: 000000000001 . | | | | | | | | | 000000000001
(total of 6 times)
Figures 1/T.4 and 2/T.4 clarify the relationship of the sig-
nals defined herein. Figure 1/T.4 shows several scan lines of data
starting at the beginning of a transmitted page. Figure 2/T.4 shows
the last coded scan line of a page.
The identification and choice of either the standard code
table or the extended code table is to be made in the pre-message
(phase B) portion of Recommendation T.30 control procedures.
Figure 1/T.4, (M), p.
Figure 2/T.4, (M), p.
4.2 Two-dimensional coding scheme
The two-dimensional coding scheme is an optional extension of
the one-dimensional coding scheme specified in S 4.1 and is as fol-
lows:
4.2.1 Data
4.2.1.1 Parameter K
In order to limit the disturbed area in the event of transmis-
sion errors, after each line coded one-dimensionally, at most K -1
successive lines shall be coded two-dimensionally. A
one-dimensionally coded line may be transmitted more frequently
than every K lines. After a one-dimensional line is transmitted,
the next series of K -1 two-dimensional lines is initiated. The
maximum value of K shall be set as follows:
Standard vertical resolution: K = 2
Optional higher vertical resolution: K = 4.
Note 1 - Some Administrations pointed out that for the
optional higher vertical resolution K may optionally be set to a
lower value.
Note 2 - Some Administrations reserve the right to approve
only such apparatus for use in the facsimile service in their
respective countries which will be able to produce a visible sign
on its received facsimile message indicating that two-dimensional
coding has been used in the transmission process.
4.2.1.2 One-dimensional coding
This conforms with the description of Data in S 4.1.1.
4.2.1.3 Two-dimensional coding
This is a line-by-line coding method in which the position of
each changing picture element on the current or coding line is
coded with respect to the position of a corresponding reference
element situated on either the coding line or the reference line
which lies immediately above the coding line. After the coding line
has been coded it becomes the reference line for the next coding
line
4.2.1.3.1 Definition of changing picture elements | (see
Figure 3/T.4)
A changing element is defined as an element whose "colour"
(i.e. black or white) is different from that of the previous ele-
ment along the same scan line
a0 The reference or starting changing element on the cod-
ing line. At the start of the coding line a0is set on an imaginary
white changing element situated just before the first element on
the line. During the coding of the coding line, the position of
a0is defined by the previous coding mode. (See S 4.2.1.3.2.)
a1 The next changing element to the right of a0on the
coding line.
a2 The next changing element to the right of a1on the
coding line.
b1 The first changing element on the reference line to the
right of a0and of opposite colour to a0.
b2 The next changing element to the right of b1on the
reference line.
Figure 3/T.4, (M) p.
4.2.1.3.2 Coding modes
One of the three coding modes are chosen according to the cod-
ing procedure described in S 4.2.1.3.3 to code the position of each
changing element along the coding line. Examples of the three cod-
ing modes are given in Figures 4/T.4, 5/T.4 and 6/T.4.
a) Pass mode
This mode is identified when the position of b2lies to the
left of a1. When this mode has been coded, a0is set on the element
of the coding line below b2in preparation for the next coding
(i.e. on a`0).
Figure 4/T.4, (M) p.
However, the state where b2occurs just above a1, as shown
in Figure 5/T.4 is not considered as a pass mode.
Figure 5/T.4, (M) p.
b) Vertical mode
When this mode is identified, the position of a1is coded
relative to the position of b1. The relative distance a1b1can take
on one of seven values V(0), VR(1), VR(2), VR(3), VL(1), VL(2) and
VL(3), each of which is represented by a separate code word. The
subscripts R and L indicate that a1is to the right or left respec-
tively of b1, and the number in brackets indicates the value of the
distance a1b1. After vertical mode coding has occurred, the posi-
tion of a0is set on a1, (see Figure 6/T.4).
c) Horizontal mode
When this mode is identified, both the run-lengths a0a1and
a1a2are coded using the code words H + M(a0a1) + M(a1a2). H is the
flag code word 001 taken from the two-dimensional code table
(Table 3/T.4). M(a0a1) and M(a1a2) are code words which represent
the length and "colour" of the runs a0a1and a1a2respectively and
are taken from the appropriate white or black one-dimensional code
tables (Tables 1/T.4 and 2/T.4). After a horizontal mode coding,
the position of a0is set on a2(see Figure 6/T.4).
4.2.1.3.3 Coding procedure
The coding procedure identifies the coding mode that is to be
used to code each changing element along the coding line. When one
of the three coding modes has been identified according to Step 1
or Step 2 mentioned below, an appropriate code word is selected
from the code table given in Table 3/T.4. The coding procedure is
as shown in the flow diagram of Figure 7/T.4.
Figure 6/T.4, (M) p.
Note - It does not affect compatibility to restrict the use
of pass mode in the encoder to a single pass mode. Variations of
the algorithm which do not affect compatibility should be the sub-
ject of further study.
Step 1
i) If a pass mode is identified, this is coded
using the word 0001 (Table 3/T.4). After this processing, picture
element a`0just under b2is regarded as the new starting picture
element a0for the next coding. (See Figure 4/T.4.)
ii) If a pass mode is not detected then proceed to
Step 2.
Step 2
i) Determine the absolute value of the relative
distance a1b1.
ii) If | d1b1 | 3, as shown in Table 3/T.4,
a1b1is coded by the vertical mode, after which position a1is
regarded as the new starting picture element a0for the next coding.
iii) If | d1b1 | > 3, as shown in Table 3/T.4,
following horizontal mode code 001, a0a1and a1a2are respectively
coded by one-dimensional coding. After this processing
position a2is regarded as the new starting picture element a0for
the next coding.
H.T. [T3.4]
TABLE 3/T.4
Two-dimensional code table
_________________________________________________________________________________
Mode Elements to be coded Notation Code word
_________________________________________________________________________________
Pass b 1, b 2 P 0001
_________________________________________________________________________________
Horizontal a 0a 1, a 1a 2 H {
001 + M(a
0a
1) + M(a
1a
2)
(see Note 1)
}
_________________________________________________________________________________
a 1 just under b 1 a 1b 1 = 0 V(0) 1
a 1b 1 = 1 V R(1) 011
a 1 to the right of b 1
Vertical
V L(1) |
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010 |
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a 1b 1 = 2
_________________________________________________________________________________
Extension {
2-D (extensions)
1-D (extensions)
} {
0000001xxx
000000001xxx
(see Note 2)
}
_________________________________________________________________________________
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Note 1 - Code M( | of the horizontal mode represents the code
words in Tables 1/T.4 and 2/T.4.
Note 2 - It is suggested the uncompressed mode is recognized as
an optional extension of two-dimensional coding scheme for Group 3
apparatus. The bit assignment for the xxx bits is 111 for the
uncompressed mode of operation whose code table is given in
Table 4/T.4.
Note 3 - Further study is needed to define other unspecified xxx
bit assignments and their use for any further extensions.
Note 4 - If the suggested uncompressed mode is used on a line
designated to be one-dimensinally coded, the coder must not switch
into uncompressed mode following any code word ending in the
sequence 000. This is because any code word ending in 000 followed
by a switching code 000000001 will be mistaken for an end-of-line
code.
Tableau 3/T.4 [T3.4], p.19
H.T. [T4.4]
TABLE 4/T.4
Uncompressed mode code words
_________________________________________________________________________________
{
Entrance code to
uncompressed mode
} {
On one-dimensionally coded line: 000000001111
On two-dimensionally coded line: 0000001111
}
_________________________________________________________________________________
Uncompressed mode code {
Image pattern
1
01
001
0001
00001
00000
} {
Code word
1
01
001
0001
00001
000001
}
_________________________________________________________________________________
{
Exit from uncompressed
mode code
} {
0
00
000
0000
} {
0000001T
00000001T
000000001T
0000000001T
00000000001T
T denotes a tag bit which tells the colour of the next run
(black = 1, white = 0).
}
_________________________________________________________________________________
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Tableau 4/T.4 [T4.4], p.20
4.2.1.3.4 Processing the first and last picture elements in
a line
a) Processing the first picture element
The first starting picture element a0on each coding line
is imaginarily set at a position just before the first picture ele-
ment, and is regarded as a white picture element (see S 4.2.1.3.1).
The first run length on a line a0a1is replaced by a0a1-1.
Therefore, if the first run is black and is deemed to be coded by
horizontal mode coding, then the first code word M(a0a1)
corresponds to a white run of zero length (see Figure 10/T.4, Exam-
ple 5).
b) Processing the last picture element
The coding of the coding line continues until the position
of the imaginary changing element situated just after the last
actual element has been coded. This may be coded as a1or 2. Also,
if b1and/or b2are not detected at any time during the coding of the
line, they are positioned on the imaginary changing element
situated just after the last actual picture element on the refer-
ence line.
4.2.2 Line synchronization code word
To the end of every coded line is added the end-of-line (EOL)
code word 000000000001. The EOL code word is followed by a single
tag bit which indicates whether one- or two-dimensional coding is
used for the next line.
In addition, EOL plus the tag bit 1 signal will occur prior to
the first Data line of a page.
Format:
EOL + 1: one-dimensional coding of next line
EOL + 0: two-dimensional coding of next line
Figure 7/T.4, (MC), p.21
4.2.3 Fill
Fill is inserted between a line of Data and the line synchron-
ization signal, EOL + tag bit, but is not inserted in Data. Fill
must be added to ensure that the transmission time of Data, Fill
and EOL plus tag bit is not less than the minimum transmission time
of the total coded scan line.
Format: variable length string of 0 s.
4.2.4 Return to control (RTC)
The format used is six consecutive line synchronization code
words, i.e., 6 x (EOL + 1).
To further clarify the relationship of the signals defined
herein, Figures 8/T.4 and 9/T.4 are offered in the case of K = 2.
Figure 8/T.4 shows several scan lines of data starting at the
beginning of a transmitted page. Figure 9/T.4 shows the last
several lines of a page.
Figure 8/T.4, (M) p.
Figure 9/T.4, (M) p.
4.2.5 Coding examples
Figure 10/T.4 shows coding examples of the first part of scan
lines and Figure 11/T.4 coding examples of the last part, while
Figure 12/T.4 shows other coding examples. The notations P, H and V
in the figures are, as shown in Table 3/T.4, the symbols for pass
mode, horizontal mode and vertical mode respectively. The picture
elements marked with black spots indicate the changing picture ele-
ments to be coded.
Figure 10/T.4, (M) p.
Figure 11/T.4, (M) p.
Figure 12/T.4, (M) p.
4.3 Error limiting mode
One-dimensional coding scheme with the division of scan line
into parts.
The one-dimensional coding scheme with the division of scan
line into parts is an optional extension of the one-dimensional
coding scheme specified in Annex B.
5 Modulation and demodulation
Group 3 apparatus operating on the general switched telephone
network shall utilize the modulation, scrambler, equalization and
timing signals defined in Recommendation V.27 | fIter , specifi-
cally SS 2, 3, 7, 8, 9, 11 and the Appendix.
5.1 The training signal to be used shall be the long training
sequence with protection against talker echo. (See
Recommendation V.27 ter , S 2.5.1, Table 3/V.27 ter ).
5.2 The data signalling rates to be used are 4800 bit/s and
2400 bit/s as defined in Recommendation V.27 | fIter .
Note 1 - Some Administrations pointed out that it would not
be possible to guarantee the service at a data signalling rate
higher than 2400 bit/s.
Note 2 - It should be noted that there are equipments in ser-
vice using, inter alia, other modulation methods.
Note 3 - Where quality of communication service can success-
fully support higher speed operation, such as may be possible on
leased circuits or high-quality switched circuits, Group 3
apparatus may optionally utilize the modulation, scrambler, equali-
zation and timing signals defined in Recommendation V.29, specifi-
cally SS 1, 2, 3, 4, 7, 8, 9, 10 and 11. Under this option the
data should be non-multiplexed and limited to the data signalling
rates of 9600 bit/s and 7200 bit/s.
6 Power at the transmitter output
The average power should be adjustable from -15 dBm to 0 dBm
but the equipment should be so designed that there is no possibil-
ity of this adjustment being tampered with by an operator.
Note - The power levels over the international circuits will
conform to Recommendation V.2.
7 Power at the receiver input
The receiving apparatus should be capable of functioning
correctly when the received signal level is within the range of
0 dBm to -43 dBm. No control of receiver sensitivity should be
provided for operator use.
8 Implementation of apparatus
Although paper sizes are referred to, this does not always
require a physical paper scanner and/or printer to be implemented.
Details may be defined by Administrations.
If the message is not generated from a physical scanner or
displayed on paper, then the signals appearing across the network
interface shall be identical to those which would be generated if
paper input and/or output had been implemented.
ANNEX A
(to Recommendation T.4)
Optional error correction mode
A.1 Introduction
This annex specifies the message format required for document
transmission incorporating the optional error correction capabil-
ity.
A.2 Definitions
The definitions contained in Recommendations T.4 and T.30
shall be applied unless explicitly amended.
A.3 Message format
An HDLC frame structure is utilized for all binary coded fac-
simile message procedures. The basic HDLC structure consists of a
number of frames each of which is subdivided into a number of
fields. It provides for frame labelling and error checking.
Specific examples are given in Figures A-1/T.4 and A-2/T.4 of
formats used for binary coded signalling. These examples show an
initial partial page (PP) frame structure and a last PP frame
structure.
In the following descriptions of the fields, the order in
which the bits are transmitted is from the most to the least signi-
ficant bit, i.e., from left to right as printed. The exception to
this is the frame number (see S A.3.6.1).
The equivalent between binary notation symbols and the signi-
ficant condition of the signalling code should be in accordance
with Recommendation V.1.
A.3.1 Synchronization
A synchronization sequence shall precede all binary coded
information whenever a new transmission begins. The synchronization
shall be a training sequence and a series of flag sequences for
nominal 200 ms, tolerance +100 ms.
Note - Continuous flags have two zeros as shown in the fol-
lowing diagram:
0111 1110 0111 1110 0111 1110
A.3.2 Flag sequence (F)
The eight bit HDLC flag sequence is used to denote the begin-
ning and end of the frame for the facsimile message procedure. The
flag sequence is also used to establish bit and frame synchroniza-
tion. To facilitate this the synchronization defined in A.3.1
should be used prior to the first frame. Subsequent frames and end
of the last frame need one or more than one flag sequence.
Format: 0111 1110
Note - The leading flag of a frame may be the trailing flag
of the previous frame.
Figure A-1/T.4, (N), p.
Figure A-2/T.4, (N), p.
A.3.3 Address field (A)
The eight bit HDLC address field is intended to provide iden-
tification of specific station(s) in a multi-point arrangement. In
the case of transmission on the general switched telephone network,
this field is limited to a single format.
Format: 1111 1111
A.3.4 Control field (C)
The eight bit HDLC control field provides the capability of
encoding the command unique to the facsimile message procedure.
Format: 1100 X000
The X bit is set to 0 for the FCD frame (facsimile coded data
frame) and the RCP frame (return to control for partial page
frame).
A.3.5 Facsimile control field (FCF)
In order to distinguish between the FCD frame (facsimile coded
data frame) and the RCP frame (return to control for partial page
frame), the FCF for the in-message procedure is defined as follows:
1) FCF for the FCD frame
Format: 0110 0000
2) FCF for the RCP frame
Format: 0110 0001
A.3.6 Facsimile information field (FIF)
The facsimile information field is a length of 257 or 65
octets (see Note 1) and is divided into two parts, the frame number
and the facsimile data field (see Note 2).
Note 1 - This does not include bit stuffing to preclude
non-valid flag sequences.
Note 2 - There is no information field in the RCP frame.
A.3.6.1 Frame number
This is an eight bit binary number. The frame number is
defined to be the first eight bits of the facsimile information
field. The least significant bit is transmitted first.
The frame number 0-255 (maximum number is 255) is used to
identify the facsimile data field (see Recommendation T.30,
Annex A).
The frame 0 is transmitted first in each block.
A.3.6.2 Facsimile data field
The coding schemes specified in S 4 are valid with the follow-
ing notes.
1) The facsimile data field is a length of 256 or
64 octets.
2) The total coded scan line is defined as the sum
of DATA bits plus the EOL bits. For the optional two-dimensional
coding scheme as described in S 4.2, the total coded scan line is
defined as the sum of DATA bits plus the EOL bits plus a tag bit
3) At the end of facsimile data field, if neces-
sary, Pad bits may be used to align on octet boundaries and frame
boundaries (see Notes 1 and 2). The format is a variable length
string of zeros.
Note 1 - The receiver is able to receive both Pad bits and
Fill bits.
Note 2 - The facsimile data field length of the final frame
including RTC signal may be less than 256 or 64 octets.
A.3.7 Frame checking sequence (FCS)
The FCS shall be a 16 bit sequence (see Recommendation T.30,
S 5.3.7).
A.3.8 Return to control for partial page (RCP)
The end of a partial page transmission is indicated by sending
three consecutive RCP frames (see Note).
Following these RCP frames, the transmitter will send the post
message commands in the framed format and the data signalling rate
of the control signals defined in Recommendation T.30, Annex A.
Note - The flag sequence following the last RCP frame shall
be less than 50 ms.
ANNEX B
(to Recommendation T.4)
Optional
error limiting mode
Note - The text of Annex B shall be refined and studied dur-
ing the next study period.
B.1 Data
B.1.1 The division of a scan line into parts
In order to limit the disturbed area in the event of transmis-
sion error, the scan lines are divided into parts before coding.
The number of parts shall be used as follows:
a) standard, 12 parts in a line composed of 1728
black and white picture elements,
b) optionally, 15 parts in a line composed of 2048
black and white picture elements,
c) optionally, 17 parts in a line composed of 2432
black and white picture elements.
Note - For alternatives b) and c), the last part of a scan
line can be shortened and then will contain 32 and 128 pels respec-
tively.
B.1.2 Scan line coding
All parts of a scan line are divided into whites (W) if they
are composed of all white picture elements and not-white (NW) if
they contain at least one black element.
The coding procedure is as shown in the flow diagram of
Figure B-1/T.4.
B.1.2.1 Shaping the extended description of a scan line
For each coded scan line the extended scan line description
(ELD) is shaped. ELD represents a sequence, where the bit number is
equal to the part number in a scan line, i.e., each part has
corresponding bit in the sequence. This bit is equal to "1", if the
part is "NW" and it is equal to "0" if the part is "W".
B.1.2.2 Scan line part coding
W-parts are not encoded. The coding of each NW-part is
independent of the coding of other parts in the given scan line. In
the NW-part the white and black runs alternate. The coding always
begins with a white run. If the actual scan line begins with a
black run then a white run length of zero will be sent. Run lengths
are encoded using Tables 1/T.4 and 2/T.4 as described in S 4.1.1.
The last run of each NW-part is not encoded. Resulted coded run
lengths (CRL) are sent directly one after another.
B.1.2.3 Code bit number variation (CBNV)
It is necessary to code and send the number of coded bits for
each NW-part. For this purpose the code bit number of the previous
NW-part qidu(em1is subtracted from the code bit number of the
given NW-part qi. The resulting difference qi - qidu(em1is coded
by using code words listed in Table B-1/T.4. For the first NW-part
in a scan line q0is taken to be 40. In the code words given in
Table B-1/T.4 the bit X corresponds to the sign of the
difference qi - qidu(em1. When the difference is positive, bit X
equals "0", but when the difference is negative bit X equals "1".
Figure B-1/T.4, (N), p.29
H.T. [1T5.4]
TABLE B-1/T.4
Code table for the code bit number variation
_____________________________________________________________________________________________________
Absolute value of variation Code Absolute value of variation Code
_____________________________________________________________________________________________________
0 100000 51 X11111 010101
1 X00001 52 X11111 010110
2 X00010 53 X11111 010111
3 X00011 54 X11111 011000
4 X00100 55 X11111 011001
5 X00101 56 X11111 011010
6 X00110 57 X11111 011011
7 X00111 58 X11111 011100
8 X01000 59 X11111 011101
9 X01001 60 X11111 011110
10 X01010 61 X11111 100000
11 X01011 62 X11111 100001
12 X01100 63 X11111 100010
13 X01101 64 X11111 100011
14 X01110 65 X11111 100100
15 X01111 66 X11111 100101
16 X10000 67 X11111 100110
17 X10001 68 X11111 100111
18 X10010 69 X11111 101000
19 X10011 70 X11111 101001
20 X10100 71 X11111 101010
21 X10101 72 X11111 101011
22 X10110 73 X11111 101100
23 X10111 74 X11111 101101
24 X11000 75 X11111 101110
25 X11001 76 X11111 101111
26 X11010 77 X11111 110000
27 X11011 78 X11111 110001
28 X11100 79 X11111 110010
29 X11101 80 X11111 110011
30 X11110 81 82 {
X11111 110100
X11111 110101
}
31 X11111 000001 83 X11111 110110
32 X11111 000010 84 X11111 110111
33 X11111 000011 85 X11111 111000
34 X11111 000100 86 X11111 111001
35 X11111 000101 87 X11111 111010
36 X11111 000110 88 X11111 111011
37 X11111 000111 89 X11111 111100
38 X11111 001000 90 X11111 111101
39 X11111 001001 91 X11111 X11110 010000
40 X11111 001010 92 X11111 X11111 000001
41 X11111 001011 93 X11111 X11111 000010
42 X11111 001100 94 X11111 X11111 000011
43 X11111 001101 95 X11111 X11111 000100
44 X11111 001110 96 X11111 X11111 000101
45 X11111 001111 97 X11111 X11111 000110
46 X11111 010000 98 X11111 X11111 000111
47 X11111 010001 99 X11111 X11111 001000
48 X11111 010010 100 X11111 X11111 001001
49 X11111 010011 101 X11111 X11111 001010
50 X11111 010100 102 X11111 X11111 001011
_____________________________________________________________________________________________________
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Tableau B-1/T.4 [1T5.4], p.
H.T. [2T5.4]
TABLE B-1/T.4 (cont.)
___________________________________________________________________________________________________________
Absolute value of variation Code Absolute value of variation Code
___________________________________________________________________________________________________________
103 X11111 X11111 001100 119 X11111 X11111 011100
104 X11111 X11111 001101 120 X11111 X11111 011101
105 X11111 X11111 001110 121 X11111 X11111 011110
106 X11111 X11111 001111 122 X11111 X11111 100000
107 X11111 X11111 010000 123 X11111 X11111 100001
108 X11111 X11111 010001 124 X11111 X11111 100010
109 X11111 X11111 010010 125 X11111 X11111 100011
110 X11111 X11111 010011 126 X11111 X11111 100100
111 X11111 X11111 010100 127 X11111 X11111 100101
112 X11111 X11111 010101 128 X11111 X11111 100110
113 X11111 X11111 010111 129 X11111 X11111 100111
114 X11111 X11111 010111 130 X11111 X11111 101000
115 X11111 X11111 011000 131 X11111 X11111 101001
116 X11111 X11111 011001 132 X11111 X11111 101010
117 X11111 X11111 011010 133 X11111 X11111 101011
118 X11111 X11111 011011 134 X11111 X11111 101100
___________________________________________________________________________________________________________
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Note - Bit X corresponds to the sign of the variation.
Tableau B-1/T.4 [2T5.4], p.
B.1.3 Data format
The data format for the scan line containing several NW-parts
is shown in Figure B-2/T.4 and containing only one NW-part is shown
in Figure B-3/T.4. The data format for the scan line containing all
whites is shown in Figure B-4/T.4.
Figure B-2/T.4, (N), p.32
Figure B-3/T.4, (N), p.33
Figure B-4/T.4, (N), p.34
B.2 End of line (EOL)
This code word follows each line of data. There is a slight
probability of occurrence of the same bit combination for ELD and
the code word EOL. This should be taken account in the decoding
algorithm. In addition, EOL is sent prior to the format data line
of the page.
Format: 000000000001
B.3 Fill
A pause in the message may be filled as described in S 4.1.3.
B.4 Return to control (RTC)
The return to control should comply with S 4.1.4.
Note - When decoding, the correction of the corrupted parts
can be performed by replacing the corrupted part with the
corresponding uncorrupted part from the previous line. The exceed-
ing of the value 144 by the decoded part length or the absence of
code word of the given part in the code table vocabulary can be
shown as a sign for replacement.
ANNEX C
(to Recommendation T.4)
Interworking between equipments with A5/A6 and A4 facilities
and between equipments with combinations of these facilities
Tableau C-1/T.4 [T6.4] A L'ITALIENNE MONTAGE: A COLLER LE TITRE ,
p.35
APPENDIX I
(to Recommendation T.4)
Guaranteed reproducible area for Group 3 apparatus
conforming to Recommendation T.4
FIGURE I-1/T.4, p. + Remarques
Figure I-2/T.4, (M), p.37
H.T. [T7.4]
TABLE I-1/T.4
Horizontal losses
_________________________________________
Printer/scanner a _ | .5 mm
_________________________________________
Enlarging b _ | .1 mm
_________________________________________
Skew c _ | .6 mm
_________________________________________
Positioning errors d _ | .5 mm
_________________________________________
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Tableau I-1/T.4 [T7.4], p.38
Figure I-3/T.4, (M), p.39
H.T. [T8.4]
TABLE I-2/T.4
Vertical losses
____________________________________________________
Paper insertion f {
_
| .07
mm
}
____________________________________________________
Skew g _ | .87 mm
____________________________________________________
Scanning density tolerance h _ | .97 mm
____________________________________________________
Gripping loss i {
_
| .07
mm
}
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Note - Scanning density tolerance will reduce to 0 mm on roll-fed
machines.
Tableau I-2/T.4 [T8.4], p.40